Retractable surgical knife



FIG. 1 is a front and top perspective view of a rectractable surgicalknife showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a back elevational view thereof; and,

FIG. 8 is a front and top perspective view thereof, with the blade inretracted position.

The ornamental design for a retractable surgical knife, as shown anddescribed.